The aim of the study was to assess the relationship between procalcitonin (PCT) serum levels and acute ischemic stroke (AIS) in a Chinese sample. All consecutive patients with first-ever AIS between January 2012 and December 2013 were recruited to participate in the study. PCT levels and National Institutes of Health Stroke Scale scores were evaluated at the time of admission. Logistic regression analysis was used to evaluate the risk for stroke according to serum PCT levels. The results indicated that serum PCT levels were significantly higher in AIS patients as compared with normal controls (P<0.0001). PCT levels increased with increasing severity of stroke, as defined by the National Institutes of Health Stroke Scale score. After adjusting for all other possible covariates, PCT level was found to be associated with an increased risk for AIS, with an adjusted odds ratio of 2.244 (95% confidence interval 1.563-3.756, P<0.0001). On the basis of the receiver operating characteristic curve, the optimal cutoff value of serum PCT levels as an indicator for auxiliary diagnosis of AIS was projected to be 1.20 ng/ml, which yielded a sensitivity of 79.6% and a specificity of 72.1%, with the area under the curve at 0.801 (95% confidence interval 0.762-0.844). An elevated serum level of PCT was a novel, independent diagnostic marker of AIS in the Chinese sample. Further study is needed to confirm these results.
To explore AC-DBD's ability in controlling dynamic stall, a practical SC-1095 airfoil of a helicopter was selected, and systematic wind tunnel experiments were carried out through direct aerodynamic measurements. The effectiveness of dynamic stall control under steady and unsteady actuation is verified. The influence of parameters such as constant actuation voltage, pulsed actuation voltage, pulsed actuation frequency and duty ratio on dynamic stall control effect is studied under the flow condition of k=0.15 above the airfoil, and the corresponding control mechanism is discussed. Steady actuation can effectively reduce the hysteresis loop area of dynamic lift, and control the peak drag and moment coefficient. For unsteady actuation, there is an optimal duty ratio DC=50%, which has the best effect in improving the lift and drag characteristics, and there is a threshold of pulsed actuation voltage in dynamic stall control. The optimal dimensionless frequency will not be found; different F + have different control advantages in different aerodynamic coefficients of different pitching stages. Unsteady actuation has obvious control advantages in improving the lift-drag characteristics and hysteresis, while steady actuation can better control the large nose-down moment.
A Complementary Low ‐temperature Poly‐Crystalline Silicon and Oxide (LTPO) technology based on p‐type Low‐temperature Poly‐Crystalline Silicon (LTPS) and n‐type oxide Thin‐Film Transistors (TFTs) was developed and demonstrated. New pixel circuits and Gate‐on‐Array (GOA) circuits were designed and fabricated using this technology. By combining the superior driving capability of LTPS and ultra‐low leakage of oxide semiconductor, all the pixel circuits and GOA circuits can operate between 1 Hz and 120 Hz, which enables both high refresh rate and low standby power display applications.
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